Hypodermic syringe



July 5, .1949. A, E; Smm 2,475,061

l HYPOD'ERMIC SYRINGE Filed Dec. 6, 1947 n Fill; .m-z', n sanita E IN VENT OR.

E Sfr/TH Patented July 5, 1949 HYPODERMIC SYRINGE' Arthur tli.,-aSmitlcl,:Los Anglesr Galif; f. Application December (1947, 'Serial`No. 790,044 I. j

6 Claims-Lr '.(Cl. 12S-218) The general ob'j'ect or the invention# is f to previdea-nrimproved syringe by lmeans-oi l which rar-y iousdrugs may be readilyarid elicientlnyL injected# #1 A more"epecic'nbjectfo my invention tn 5 provde'ia syringeof the disposable ampulef-t-yne Whereinwas'yringe barrelfand adisnosable ampule f are employedfand wherein-it'h'e barrel. and arnpule@havenovelepartsaL Another-objeetof-the invention isito :provide v noVelf-arnpuleP-includi-n'g novel -ston1-ol= nx `Y 'f A furtherf-bbjectf'of the -inventionxisto-pno15 vide an AVampule"syringe -includingnovelnfleans f locking the `syringe plunger4 to the piston '-'corkz of the ampule.

Othei"objects`= and advantages of the invention will apparent iromthe following description r20 taken-linconnection--witliJ -tli'e accompanying drawings; lwherein f Figjf3-11s'ahem-ral, sectional-view 'ei-tbe amnule insentediinthe barrel -and.beforefthe syringe vhas f beenplace'ddn.- condition for-fuse;

Fig. f5 iis' a fcentral, 4:sectional `View. partly elevationshowinglthe syringe a-fterlthe medicinal preparationehas beenfdiseharged' 'A ,Figjifis a fragmentary, sectional View, showing 35 a modication-fbtmy invention. M

Referring-to the drawing'by reference' @haran` ters, I have shown-mtrfinvention-y asembodiedina y syringe-#which i-s-findicatedvgener-931V at: i9.. .As showrnthe'syringeincludes a .barrel-fl Iwhich has 40 a. centralborellLand-an arcuate, fing ang'e-@l's-'the'reomm At the front-end -barrelwhas la fronti-membe-ril'l! v secured thereonw'l frontfmemberzinoludes. avforwardly directedportioni 15b-and lhas 1 a1frusto-conical le 45 theneinvfwhichA-at its` outer'end has asubstan-iallyl v f hemispherioaliseat'IIL- At its rear endfthebarrel v has la nollar-'flwhich maybefsoldere in Thi ollarisfinternally 'threaded -`|as at i3. 'fl' In the barrellarrange an ampule centeringr and 50 holding'fmember- 129.' 'The member @il includes a bOd5`I'-21-,` slidab1e-within the barrel," and-an integral, rearwardly-directeclsleeve 22;" The 22 isfcylindrical"andar its outer end includesl a threaded pcrrtinfr-23'*whichiseadaptedV to Jtlfirea'd-iJ #'55 includes a"`skirt 21,"slidab1e over 'the rear end of Y Y" the barrel. 1

Theirontkend of` the ampule engaging member..

is bevelled asfatfi and` is adapted ,to engage and centerthe end 31 o'f'anfampule 32.*which contains portioirof the barrel in Whichlthe centering mem- Y. u

ber 2^slides`sothat the Ashouldenls providedby the 'change diameter affords la stop for the centering member;

The 'ampnle 'includes afront cork .34 made of rubber and includesja bodyr adapted. to. be seatedvinthe ampu1e, a shoulder- 35 engaging the end ofthe ampuleand atapering.,.fonwardlypro-xjectingtip 31 Whichlhasa hemispherical seat 36- v v at its forward `end'.The stoppervd includes .cc-

axialxfrontlandrear recess/esiti) and Ml, sepa-M ratedjby'., aidiaphragmqll. .At the .inner end-of. the ampule I arrangea .pistonstopper Q5 whicn-v has peripheral.. beadsAl. slaldably.4 yengagingA thev interior of the amp11le.. .I The piston stopper 'is made oirubber and. is.4 provided with'a .reetangue s lar slot AT Whichfdpens. rearwardly andat itsinner- -Y end isliclosedand is provided Withfarcuateslots 48 which intersect--the rectangular. .slot M.

A plunger.isfzadaptedfto .slide in the bore 5I of the centering member. Z0. .This plunger. has a thumb-engagingear endr4 52 which. may :be threaded in'placeand at, its frontend has al shoulder. 53 fromwhichastem-.tl projects.` The shoulder .53 engas..the end ofthe piston stopper rte.- push .the .latter.-..y'-Ihe stem Ahas, a trans#- verselbar mounted thereon which spreferably rectangular. and is substantiallyethe same-:size

as the rectangular. slot/M` wTheirontend offthe centeringmmember includes aurecess-56 in which-1 the shoulder 53 is seated.

On the ampu'lesI arrange'fafmeedle which includes'nafronteportion6tlg a rear portion 6l and a nemispnericalfintermediate portion 62. vThe barrel. includes-arlarge ampule introduction -slot `$5 andai-smaller slot which may be used to' assis-tin the @removalmf the ampule. A protec-r tionf cap6fl-en`gages the tip @Tof-the ampule to maintain--the needle sterile;I 'f

In use the plunger is fully- Withdrawn and the ampu-leyin'the conditionu shown in Fig.3, is insertedthroughthesiot65 to assume-the position 3 the tip I5 in Fig. 3 with the pointed end of the needle not piercing the diaphragm 35.

The operator then pushes the rear member 26 forwardly until the threads 23 engage the threads I9, whereupon the rear member is rotated, causing the threads to engage and moving the centering member against the ampule, thus centering the ampule and pushing it forwardly in the barrel so that it assumes the position shown in Fig. 4, causing the needle to pierce the diaphragm 4I. The operator then pushes the plunger forward, causing the cross member 55 on the plunger to enter the slot 41. The plunger is then advanced in the slot until it reaches the inner end thereof, whereupon the plunger is rotated, thus causing the cross member 55 to enter the arcuate slot i8 to thereby lock the parts together. The syringe is now ready for use.

After the needle has been inserted in the patient, the plunger may be advanced slightly and then withdrawn. If blood appears in the ampule the needle is in a blood vessel and should be withdrawn and a fresh insertion made.

In Fig. 7 I show "a modification of my invention wherein parts similar to those previously described are designated by single primed reference numerals. In the modication the inner end 'M of the needle is in the form of a tube and instead of the recess 40 I provide an outer recess 'Iii and an inner recess 1|. A sealing disc 'l2 is seated in the recess 10, and in the recess l!! I place a medicinal tablet 13. 'Ihe vehicle for the tablet 13 is contained in the ampule. In use the ampule is inserted in the bore l2' of the barrel and when pushed forward, as described above, the inner end of the portion 'Hi will pierce the diaphragm 4| and will dislodge the disc 12, causing the tablet 13 to be placed in the liquid .in the ampule, whereupon the tablet will be dissolved to provide a fresh solution.

From the foregoing description it will be apparent that I have invented a novel hypodermic syringe which can be economically manufactured and which is highly eicient for its intended use.

Having thus described my invention, I claim:

1. A syringe including a barrel and an ampule, said .syringe including a front member having a hole therethrough, an ampule holding member slidable within the barrel, said holding member including an externally threaded portion, said barrel having an internally threaded portion at the rear end thereof, said holding member being slidable in said threaded portion, said threads being engageable, a plunger slidable within said holding member, said ampule having a front member thereon. said front member having an axial bore and having a diaphragm closing the inner end of said bore, a needle in said bore, said needle being shiftable to pierce the diaphragm, piston stopper in the rear end of said ampule, and means to releasably connect the stopper to the plunger.

2. A syringe including a barrel and an ampule, said syringe including a front member having a hole therethrough, a rear member slidable on said barrel, a tubular ampule holding member mounted on said rear member, said holding member including an externally threaded portion. said barrel having a collar at the rear end thereof, said holding member being slidable in said collar, said collar being internally threaded to engage the threads on said holding member, a plunger slidable within said holding member, an ampule in said barrel, said ampule having a front member thereon, said front member having an axial bore and having a diaphragm closing the inner end of said bore, a needle in said bore, said needle being shiftable to pierce the diaphragm, and a piston stopper in the rear end of said ampule, and connecting `means on the inner end portion of the plunger and the piston stopper to releasably lock the plunger to the stopper.

3. A syringe including a barrel and an ampule, said syringe including a front member having a hole therethrough, a rear member being slidable on said barrel, a tubular ampule holding member on said rear member, said holding member including an externally threaded portion, said barrel having a collar at the rear end thereof, said holding member being slidable in said collar, said collar being internally threaded to engage the threads on said holding member, a plunger slidable within said holding member, said plunger having a shoulder on the inner portion thereof and having a stern projecting forwardly from said shoulder, a transverse bar on said stem, an ampule in said barrel, said ampule having a front member thereon, said front member having a bore and having a diaphragm closing the inner end of said bore, a needle in said bore, said needle being shiftable to pierce the diaphragm, and a piston stopper in the rear end of said ampule, said stopper having a rectangular slot extending inwardly from the rear end thereof, said piston stopper having arcuate slots intersecting the rectangular slot, said transverse bar being of a size to first enter said rectangular slot and upon rotation to enter said arcuate slots, said shoulder on the plunger being adapted to engage and push the end of the piston stopper when the transverse bar is in the arcuate recesses.

4. A syringe includnig a barrel, said syringe barrel including a front member having a hole therethrough and having a substantially hemispherical recessed portion adjacent to said hole, a rear member slidable on said barrel, an ampule centering and holding member mounted on said rear member, said centering and holding member having a bevelled front face, said barrel having a shoulder limiting the inward movement of said centering and holding member, said centering and holding member including an integral sleeve having an externally threaded portion thereon, said barrel having a collar at the rear end thereof, said sleeve being slidable in said collar, said collar being internally threaded to engage the threads on said sleeve, a plunger slidable within said sleeve, said plunger having a shoulder on the inner portion thereof and having a stem projecting forwardly from said shoulder, and a transverse bar on said stem.

5. A syringe including a barrel and an ampule, said barrel including a front member having a hole therethrough, a rear member slidable on said barrel, an ampule holding member on said rear member, said holding member including an integral sleeve having an externally threaded portion thereon, said barrel having a collar at the rear end thereof, said sleeve being slidable in said collar, said collar being internally threaded to engage the threads on said sleeve, a plunger slidable Within said sleeve, said plunger having a shoulder on the inner portion thereof and having a stem projecting forwardly from said shoulder, a transverse bar on said stem, an ampule in said barrel, said ampule having a front member thereon, said front member having an axial bore and having a diaphragm closing the inner end of said bore, a needle in said bore, said needle having a protuberance thereon, said needle being shiftable to pierce the diaphragm, and a pistion stopper in the rear end of said ampule, said stopper having a rectangular slot extending inwardly from the rear end thereof, said piston stopper having arcuate slots intersecting the rectangular slot, said transverse bar being of a size to first enter said rectangular slot and upon rotation to enter said arcuate slots, said shoulder on the plunger being adapted to engage and push the end of the piston stopper when the transverse bar is in the arcuate recesses.

6. A syringe including a barrel and an ampule, said syringe barrel including a front member having a hole therethrough and having a substantially hemispherical recessed portion adjacent to said hole, a rear member slidable on said barrel, an ampule centering and holding member mounted on said rear member, said centering and holding member having a bevelled front face, said barrel having a shoulder limiting the inward movement of said centering and holding member, said centering and holding member including an integral sleeve having an externally threaded portion thereon, said barrel having a collar at the rear end thereof, said sleeve being slidable in said collar, said collar being internally threaded to engage the threads on said sleeve, a plunger slidable within said sleeve, said plunger having a shoulder on the inner portion thereof and having a stem projecting forwardly from said shoulder, a transverse bar on said stem, said barrel having 6 an ampule receiving slot, an ampule in said barrel, said ampule having a front member thereon, said front member having an axial bore and having a diaphragm closing the inner end of said bore, a needle in said bore, said needle having a protuberance thereon engaging in said substantially hemispherical recess, said needle being shiftable to pierce the diaphragm, and a piston stopper in the rear end of said ampule, said stopper having a rectangular slot extending inwardly from the rear end thereof, said piston stopper having arcuate slots intersecting the rectangular slot, said transverse bar being of a size to rst enter said rectangular slot and thereafter upon rotation to enter said arcuate slots, said shoulder on the plunger being adapted to engage and push the end of the piston stopper when the transverse bar is in the arcuate recesses.

ARTHUR E. SMITH.

REFERENCE S CITED The following referenlces are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,709,637 Steuer Apr. 16, 1929 2,193,489 Nevin Mar. 12 1940 FOREIGN PATENTS Number Country Date 581,848 Germany Aug. 3, 1933 

